US3587358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-temperature fabrication of diamond-faced drilling bits
Assignee: Tone Boring Co Ltd
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Filing: 1968-11-21
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Granted: 1971-06-28
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Expires: 1988-11-21
Abstract
Abstract DIAMOND PARTICLES ARE SECURED TO A DRILLING BIT BODY BY A METAL LAYER DEPOSITED BY ELETROCASTING. MELT SPRAYING OF THE RESULTING BIT WITH MOLTEN METAL MAY BE ADDITIONALLY CARRIED OUT. THROUGHOUT THE PROCESS, THE DIAMOND PARTICLES ARE NOT SUBJECTED TO TEMPERATURES EXCEEDING APPROXIMATELY 150*C., WHEREBY THEIR PROPERTIES ARE NOT IMPAIRED, AND HIGH DRILLING PERFORMANCE OF THE BIT IS AFFORDED.
Inventors
- 👤 Kunihiro Yoshino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:40
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/48; B; B24; B24D; B24D18/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |